AWS CloudTrail is now available in Tokyo, Singapore and Sao Paulo regions. By turning on CloudTrail in these regions, you gain increased visibility into API calls made on your AWS account. CloudTrail records API calls made on your AWS account and delivers log files to an Amazon S3 bucket you specified. The log files generated by CloudTrail enables you to perform operational troubleshooting, security incident analysis, track changes to AWS resources and makes it easier to ensure compliance with internal policies and regulatory standards. For more details, see the AWS compliance white paper, Security at Scale: Logging in AWS.